I've used the Clang Static Analyzer from the command line before. I wanted to try Xcode's built-in version via Build & Analyze. I never get any negative results even though i specially prepared my code with very obvious issues Clang was always able to point out:

    // over-releasing an object:
    [label release];
    [label release];

    // uninitialized vars, allocating but not freeing an object
    NSString* str;
    int number;
    CCLabel* newLabel = [[CCLabel alloc] initWithString:str fontName:str fontSize:number];
    [newLabel setPosition:CGPointZero];

The result is always the same: a green checkbox, no issues. I read that C++ code can cause issues. I'm running this with cocos2d that includes box2d. Could this be a cause? Did anyone get results from Build & Analyze with the cocos2d engine? What else could it be?

I also tried enabling the Static Analyzer Build Settings and then Build but the result was the same. I have restarted Xcode, cleaned all targets and emptied Xcode caches to no avail.